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Jacobs introduces new engine brake

Jacobs Vehicle Systems has launched 1.5 Stroke HPD, a variation of the innovative High Power Density engine brake that the company introduced on a demonstration truck in 2016.

According to Jacobs, the new HPD option provides trucks with significantly higher with less complexity and cost than Two-Stroke HPD.

As with Two-Stroke HPD, 1.5 Stroke HPD provides small and medium displacement engines with large engine displacement retarding power.

“With 1.5 Stroke HPD ... our customers [will] achieve the same step-change in braking performance as with Two-Stroke HPD, if their engine hardware allows for that,” said Steve Ernest, vice president of engineering & business development at Jacobs Vehicle Systems. “Engine braking options can be easily specified and adapted by geographic market, application, and lifecycle requirements.”

Jacobs said that 1.5 Stroke HPD realizes braking power improvements of up to 40% at high engine speeds when compared with traditional compression release braking and improvements of up to 100% at low engine speeds. The low rpm benefits are especially important because of the increasing numbers of engines with higher power density and lower operating speeds.